Power okay but won't work

what is your model number is then we can get started then okay

many things will cause no start problems could have faulty ignition switch.use test light see if power going to starter if not check ignition fuse to starter.if power going to starter, more likely starter solenoid or starter faulty.if ignition fuse okay and starter and solenoid okay still no start problem could be in the ignition switch or inhibitor switch faulty.code scan for faulty theft security system which will also cause no start conditions.

Check to make sure the connectors in the back of the radio are not loose. If this isn't the problem, the radio may have to be sent in for repair.

You just go to the link I attached I'm sure you will get the solution of your problem.
John Deere 310G

If the red light won't come on it is not getting power.First,try plugging it in to a different outlet,or unplug one of the gadgets you know is working and plug the tv in there.You are simply switching.If you know that there is power coming from the outlet and it still won't come on then you'll have to check the cord;don't go much farther than that without expert help.

check the power connections, if its okay change the power supply or smps

Yes that is unfortunately true, if it is out of warranty they won't be able to replace the printer. However, it can be traded for upgrade for an HP factory reconditioned printer for a lesser cost.

IF COOLANT FAN FUSE AND RELAY OKAY.HOT WIRE COOLANT FAN TO SEE IF FAN MOTOR OKAY.IF FAN MOTOR OKAY.THE ENGINE COOLANT TEMPERATURE SENSOR MORE LIKELY BAD.THE ENGINE COOLANT SENSOR WHEN ENGINE COOLANT GETS HOT IT CAUSES ENGINE COOLANT TEMPERATURE RESISTANCE TO DECREASE CAUSE COMPLETE CIRCUIT IN WHICH POWER FROM PCM TO ECT SENSOR WILL SENT POWER TO COOLANT FAN RELAY THEN CAUSE COOLANT FAN TO TURN ON. HAVE ECT SENSOR OR ENGINE COOLANT TEMPERATURE SENSOR CHECK USING CODE SCANNER TO MAKE SURE ITS WORKING BEFORE SPENDING EXCESS MONEY.

Why would you mention motor oil & trans fluid,
you should check i,t as well as tire pressure,
but your lack of power can only be resolved
by going through the entire car,testing as you go

You should have a maint log book & know what
was done & when,since you owned it.

If you work on your own veh say so ,otherwise you
need to discuss your veh issues with a local repair shop

Don't just leave it at a shop without going on a road
test with yourself present & spending time explaining
what you want resolved

A tune-up won't do anything but take your money
It is an out dated term
Computers have been tuneing engines since 1980
some 31 years

Basically you cannot break you woofer with too powerful amp, but you can break it using too weak amp. This is because if you don't have enough watts going to you woofer the cones movement isn't controlled properly. I'm usually using +20% to the woofers RMS and peak power. This will also make the amp last longer because you won't use it at it's peak performance all the time. If possible use manufacturer whose prising policy matches your woofers manufacturers, that way you won't end up with "2000w peak power" cheap amp with real output of 30w. and in the other end cheap woofer won't handle expensive amp with real 600w rms so well, you need to find a midlle way here. Hard to say without knowing the make and model of the woofer.
This is a taste question for some people, and I haven't build a system to match so powerful woofer ever in my life. But I'm pretty sure you won't go wrong with this one.